SUS304 VS SS304 Stainless Steel

SUS304 & SS 304 Chemical Composition

Corrosion Resistance

In a broad spectrum of atmospheric settings and many corrosive media, stainless steel grade 304 is outstanding. In warm chloride environments, it is subject to pitting and crevice corrosion and stresses corrosion cracking above 60 ° C (approximate). Grade 304 is considered to be resistant to drinking water at ambient temperatures up to about 200 mg / L of chloride, reducing it to about 150 mg / L at 60 ° C.

Physical Properties

Welding

Grade 304 has outstanding weldability with and without filler metals through all conventional fusion techniques As 1554.6 pre-qualifies were 304welding with Grade 308 and 304L with 308L tubes or electrodes (and their elevated equivalents in silicon). For peak corrosion resistance, substantial welded segments in grade 304 may involve post-welded annealing. This not need for Grade 304L. If heavy section welding is required and post-weld heat treatment is not feasible, Grade 321 may also used as an option to 304.

In the heated portion, intrinsic corrosion called intergranular corrosion can happen when welding stainless steel, so if weldability is give priority, it has specialized for this intergranular corrosion resistance. You can also choose a grade of stainless steel. Metals have a great picture at elevated temperatures, but when used in a cryogenic environment they may become fragile and crack, but it is known that SUS304 is an outstanding grade of steel for fracture toughness in these settings. A lot of austenitic stainless steel comes from adding and removing different alloy components based on this SUS304, so it's a starting material that can be said to be the mother of other SUS components.

Grade Specification Comparison